Cyclic aeration system for submerged membrane modules

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/12 (2006.01) B01D 65/02 (2006.01) C02F 1/44 (2006.01) C02F 3/06 (2006.01) C02F 3/20 (2006.01)

Patent

CA 2345682

An aeration system for a submerged membrane module has a set of aerators connected to an air blower, valves and a controller adapted to alternately provide a higher rate of air flow and a lower rate of air flow in repeated cycles. In an embodiment, the air blower, valves and controller, simultaneously provide the alternating air flow to two or more sets of aerators such that the total air flow is constant, allowing the blower to be operated at a constant speed. In another embodiment, the repeated cycles are of short duration. Transient flow conditions result in the tank water which helps avoid dead spaces and assists in agitating the membranes.

Un système d'aération destiné à un module à diaphragme immergé comprend un ensemble d'aérateurs reliés à une soufflante d'air, des vannes et un régulateur adaptés pour fournir alternativement un débit de flux d'air élevé et un débit de flux d'air réduit en cycles répétés. Dans un mode de réalisation, la soufflante d'air, les vannes et le régulateur fournissent simultanément le flux d'air alterné à au moins deux ensembles d'aérateurs de manière que le flux d'air total soit constant, ce qui permet de faire fonctionner la soufflante à un régime constant. Dans un autre mode de réalisation, les cycles répétés sont d'une durée courte. On obtient ainsi des conditions de flux transitoires dans l'eau du réservoir ce qui permet d'éviter les espaces morts et contribue à agiter les diaphragmes.

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